Effects of nanoscale hydroxypropyl lignin on properties of soy protein plastics

Wiley - Tập 101 Số 1 - Trang 334-341 - 2006
Pu Chen1,2, Lina Zhang1,2, Shuping Peng3, Bing Liao3
1Center of Nanoscience and Nanotechnology, Wuhan University, Wuhan 430072, People's Republic of China
2Department of Chemistry, Wuhan University, Wuhan 430072. People's Republic of China
3Key Laboratory of Cellulose Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, People's Republic of China

Tóm tắt

AbstractFor the first time, soy protein isolate (SPI)/hydroxypropyl alkaline lignin (HPL) composites have been successfully prepared by mixing them in aqueous solution containing a small amount of glutaraldehyde as compatibilizer, and then compression‐molded to obtain plastic sheets. The structures of the SPI/HPL composites were characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, transmission electron microscopy, and scanning electron microscopy, indicating the existence of amorphous networks and nanoscale HPL dispersion in the SPI matrix. When HPL content was lower than 6 wt %, the HPL‐domain occurred in SPI/HPL composites with a dimension of about 50 nm, indicating a high interfacial activity. Differential scanning calorimetry analysis showed that the glass transition temperature of the SPI/HPL sheets increased from 62.5 to 70.4°C with an increase of HPL content from 0 to 6 wt %. Moreover, the tensile strength of the SPI/HPL nanocomposite sheets with 6 wt % HPL and 3.3 wt % glutaraldehyde was enhanced from 8.4 to 23.1 MPa compared with that of the SPI sheets, suggesting that the nanoscale HPL dispersion significantly reinforced the SPI materials. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 334–341, 2006

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Wiley

Tập 101 Số 1

334-341

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